game/main.ts

@@ -1,8 +1,6 @@
 import { cls, print, spr, use_texture } from "./graphics";
 import { load_texture } from "./assets";
-import { since_start } from "./time";
+import { since_start, since_last_frame } from "./time";
-import { btn, Button } from "./input";
-import { new_v2, vadd, vmul, vnorm } from "./vector";
 
 let bot_sprite: number | undefined = undefined;
 
@@ -16,39 +14,7 @@ export function init() {
   });
 }
 
-const friction = 0.6;
+export function update() {}
-let robo_vel = new_v2(0);
-let robo_pos = new_v2(10);
-
-export function update() {
-  // Acceleration from input
-  let a = new_v2(0);
-  if (btn(Button.Up)) {
-    a.y -= 1;
-  }
-  if (btn(Button.Down)) {
-    a.y += 1;
-  }
-  if (btn(Button.Left)) {
-    a.x -= 1;
-  }
-  if (btn(Button.Right)) {
-    a.x += 1;
-  }
-  vnorm(a);
-
-  // Friction
-  let v = vmul(robo_vel, friction);
-  v = vadd(v, a);
-
-  // Motion
-  let np = vadd(robo_pos, v);
-
-  // TODO: Collide.
-
-  robo_pos = np;
-  robo_vel = v;
-}
 
 export function draw() {
   cls(0.1, 0.2, 0.3);
@@ -56,7 +22,8 @@ export function draw() {
     // ...it gets resolved here?
     use_texture(bot_sprite);
 
-    spr(robo_pos.x, robo_pos.y, 32, 32, 0, 0);
+    let y = (since_start() * 10) % 240;
+    spr(10, y, 32, 32, 0, 0);
   }
   // print("FRAME TIME:", since_last_frame());
 }

game/vector.ts

@@ -1,49 +0,0 @@
-export interface Vec2 {
-  x: number;
-  y: number;
-}
-
-export function new_v2(x: number, y: number | undefined = undefined): Vec2 {
-  y = y || x;
-  return { x, y };
-}
-
-function vecargs(v: Vec2 | number): Vec2 {
-  if (typeof v == "number") {
-    return new_v2(v, v);
-  } else {
-    return v;
-  }
-}
-
-export function vadd(a: Vec2, b: Vec2 | number): Vec2 {
-  b = vecargs(b);
-  return { x: a.x + b.x, y: a.y + b.y };
-}
-
-export function vsub(a: Vec2, b: Vec2 | number): Vec2 {
-  b = vecargs(b);
-  return { x: a.x - b.x, y: a.y - b.y };
-}
-
-export function vmul(a: Vec2, b: Vec2 | number): Vec2 {
-  b = vecargs(b);
-  return { x: a.x * b.x, y: a.y * b.y };
-}
-
-export function vdiv(a: Vec2, b: Vec2 | number): Vec2 {
-  b = vecargs(b);
-  return { x: a.x / b.x, y: a.y / b.y };
-}
-
-export function vlen(a: Vec2): number {
-  return Math.sqrt(a.x * a.x + a.y * a.y);
-}
-
-export function vnorm(a: Vec2) {
-  const length = vlen(a);
-  if (length > 0) {
-    a.x /= length;
-    a.y /= length;
-  }
-}

src/input.ts

@@ -1,11 +0,0 @@
-export const Button = {
-  Up: 0,
-  Down: 1,
-  Left: 2,
-  Right: 3,
-} as const;
-type Button = (typeof Button)[keyof typeof Button];
-
-export function btn(_which: Button): boolean {
-  return false;
-}